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题名: Investigations on transfer of water and vanadium ions across Nafion membrane in an operating vanadium redox flow battery
作者: Sun, Chenxi1, 2;  Chen, Jian1;  Zhang, Huamin1;  Han, Xi1;  Luo, Qingtao1, 2
关键词: Vanadium redox flow battery ;  Water transfer ;  Vanadium ions transfer ;  Nafion membrane
刊名: JOURNAL OF POWER SOURCES
发表日期: 2010-02-01
DOI: 10.1016/j.jpowsour.2009.08.041
卷: 195, 期:3, 页:890-897
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Electrochemistry ;  Energy & Fuels
英文摘要: Diffusion coefficients of the vanadium ions across Nafion 115 (Dupont) in a vanadium redox flow battery (VRFB) are measured and found to be in the order of V(2+) > VO(2+) >VO(2)(+) > V(3+). It is found that both in self-discharge process and charge-discharge cycles, the concentration difference of vanadium ions between the positive electrolyte (+ve) and negative electrolyte (-ve) is the main reason causing the transfer of vanadium ions across the membrane. In self-discharge process. the transfer of water includes the transfer of vanadium ions with the bound water and the corresponding transfer of protons with the dragged water to balance the charges, and the transfer of water driven by osmosis. In this case, about 75% of the net transfer of water is caused by osmosis. in charge-discharge cycles, except those as mentioned in the case of self-discharge, the transfer of protons with the dragged water across the membrane during the electrode reaction for the formation of internal electric circuit plays the key role in the water transfer. But in the long-term cycles of charge-discharge. the net transfer of water towards +ve is caused by the transfer of vanadium ions with the bound water and the transfer of water driven by osmosis. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
关键词[WOS]: CATION-EXCHANGE MEMBRANES ;  TRANSPORT
语种: 英语
WOS记录号: WOS:000271171900030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141685
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Lab PEMFC Key Mat & Technol, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

Recommended Citation:
Sun, Chenxi,Chen, Jian,Zhang, Huamin,et al. Investigations on transfer of water and vanadium ions across Nafion membrane in an operating vanadium redox flow battery[J]. JOURNAL OF POWER SOURCES,2010,195(3):890-897.
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